Cloned from launchpad blueprint https://blueprints.launchpad.net/keystone/+spec/pagination-backend-support.

Description:

In v3, our identity APIs support pagination.  However, such pagination support is only skin deep - in that the controller re-fetches the entire list upon each "get next page" request from the client.  We should therefore extend the pagination into the backends (e.g. SQLAlchemy supports such a concept) to improve the scaling and performance of keystone.

A good pagination system will still require good filtering.  The addition of this is covered by a separate blueprint (https://blueprints.launchpad.net/keystone/+spec/filtering-backend-support)

Related wishlist bug: https://bugs.launchpad.net/keystone/+bug/1009023

Specification URL (additional information):

https://etherpad.openstack.org/pagination